Mayhew 1952 Experimental May 12 Mallard E34 Readings taken at Gibson Ranch & Thomas Ranch on storing facilities for hatching eggs were as follows (taken 3/29/52): Thomas Gibson 55% rel. humidity 50% R.H. 16°C, temp. 16°C, temp. 2 more Gibson eggs hatched at 75% & 2 more at 85% today. Thus, 21 eggs hatched out of 92 fertile ones, for a 23% hatch. 6 more eggs pipped, but did not hatch: 40% - 0 eggs (On examination, all 65% - 1 .. of these eggs showed 75% - 2 .. they had pipped too 85% - 2 .. early - lots of yolk 90% - 1 .. yet to be absorbed.) The rate of hatching was as follows: No. Date Set Date Hatched Rel. Humidity 1 4/12/52 5/9/52 40% 3 " 5/9/52 65% 4 " 5/10/52 65% 6 " 5/10/52 75% 1 " 5/11/52 75% 2. " 5/11/52 85% 2 " 5/12/52 75% 2 " 5/12/52 85% The 6 pipped eggs were broken open & the following was observed: 65% - 1 egg ready to hatch, but it appeared as though the outer membranes had stuck to the duckling's body.